drivers/usb/serial/cp210x.c

   1 /*
   2  * Silicon Laboratories CP210x USB to RS232 serial adaptor driver
   3  *
   4  * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License version
   8  *      2 as published by the Free Software Foundation.
   9  *
  10  * Support to set flow control line levels using TIOCMGET and TIOCMSET
  11  * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
  12  * control thanks to Munir Nassar nassarmu@real-time.com
  13  *
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/errno.h>
  18 #include <linux/slab.h>
  19 #include <linux/tty.h>
  20 #include <linux/tty_flip.h>
  21 #include <linux/module.h>
  22 #include <linux/moduleparam.h>
  23 #include <linux/usb.h>
  24 #include <linux/uaccess.h>
  25 #include <linux/usb/serial.h>
  26 #include <linux/gpio/driver.h>
  27 #include <linux/bitops.h>
  28 #include <linux/mutex.h>
  29
  30 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
  31
  32 /*
  33  * Function Prototypes
  34  */
  35 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
  36 static void cp210x_close(struct usb_serial_port *);
  37 static void cp210x_get_termios(struct tty_struct *, struct usb_serial_port *);
  38 static void cp210x_get_termios_port(struct usb_serial_port *port,
  39         tcflag_t *cflagp, unsigned int *baudp);
  40 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *,
  41                                                         struct ktermios *);
  42 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
  43                                                         struct ktermios*);
  44 static bool cp210x_tx_empty(struct usb_serial_port *port);
  45 static int cp210x_tiocmget(struct tty_struct *);
  46 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
  47 static int cp210x_tiocmset_port(struct usb_serial_port *port,
  48                 unsigned int, unsigned int);
  49 static void cp210x_break_ctl(struct tty_struct *, int);
  50 static int cp210x_attach(struct usb_serial *);
  51 static void cp210x_disconnect(struct usb_serial *);
  52 static void cp210x_release(struct usb_serial *);
  53 static int cp210x_port_probe(struct usb_serial_port *);
  54 static int cp210x_port_remove(struct usb_serial_port *);
  55 static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
  56
  57 static const struct usb_device_id id_table[] = {
  58         { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
  59         { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
  60         { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  61         { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  62         { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
  63         { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */
  64         { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
  65         { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
  66         { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */
  67         { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
  68         { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
  69         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  70         { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
  71         { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
  72         { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */
  73         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  74         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  75         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
  76         { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
  77         { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
  78         { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
  79         { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
  80         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
  81         { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
  82         { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
  83         { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
  84         { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
  85         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
  86         { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
  87         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  88         { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */
  89         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  90         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
  91         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  92         { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
  93         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  94         { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
  95         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
  96         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
  97         { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */
  98         { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
  99         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
 100         { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */
 101         { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
 102         { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
 103         { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
 104         { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */
 105         { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
 106         { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
 107         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
 108         { USB_DEVICE(0x10C4, 0x81D7) }, /* IAI Corp. RCB-CV-USB USB to RS485 Adaptor */
 109         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
 110         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
 111         { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
 112         { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
 113         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
 114         { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
 115         { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
 116         { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */
 117         { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
 118         { USB_DEVICE(0x10C4, 0x82F4) }, /* Starizona MicroTouch */
 119         { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
 120         { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
 121         { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
 122         { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
 123         { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
 124         { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
 125         { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
 126         { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
 127         { USB_DEVICE(0x10C4, 0x8470) }, /* Juniper Networks BX Series System Console */
 128         { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
 129         { USB_DEVICE(0x10C4, 0x84B6) }, /* Starizona Hyperion */
 130         { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
 131         { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
 132         { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */
 133         { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
 134         { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
 135         { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */
 136         { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */
 137         { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */
 138         { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */
 139         { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */
 140         { USB_DEVICE(0x10C4, 0x8962) }, /* Brim Brothers charging dock */
 141         { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */
 142         { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */
 143         { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
 144         { USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
 145         { USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
 146         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
 147         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
 148         { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */
 149         { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
 150         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
 151         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
 152         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
 153         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
 154         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
 155         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
 156         { USB_DEVICE(0x12B8, 0xEC60) }, /* Link G4 ECU */
 157         { USB_DEVICE(0x12B8, 0xEC62) }, /* Link G4+ ECU */
 158         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
 159         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
 160         { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */
 161         { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */
 162         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 163         { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */
 164         { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */
 165         { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */
 166         { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */
 167         { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */
 168         { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */
 169         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 170         { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
 171         { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
 172         { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
 173         { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
 174         { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */
 175         { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */
 176         { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
 177         { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
 178         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 179         { USB_DEVICE(0x18EF, 0xE025) }, /* ELV Marble Sound Board 1 */
 180         { USB_DEVICE(0x18EF, 0xE032) }, /* ELV TFD500 Data Logger */
 181         { USB_DEVICE(0x1901, 0x0190) }, /* GE B850 CP2105 Recorder interface */
 182         { USB_DEVICE(0x1901, 0x0193) }, /* GE B650 CP2104 PMC interface */
 183         { USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
 184         { USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
 185         { USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
 186         { USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
 187         { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
 188         { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */
 189         { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */
 190         { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
 191         { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */
 192         { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */
 193         { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */
 194         { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */
 195         { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */
 196         { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */
 197         { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */
 198         { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */
 199         { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */
 200         { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */
 201         { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */
 202         { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */
 203         { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */
 204         { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */
 205         { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */
 206         { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */
 207         { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */
 208         { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */
 209         { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */
 210         { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */
 211         { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */
 212         { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */
 213         { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */
 214         { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
 215         { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */
 216         { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */
 217         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
 218         { } /* Terminating Entry */
 219 };
 220
 221 MODULE_DEVICE_TABLE(usb, id_table);
 222
 223 struct cp210x_serial_private {
 224 #ifdef CONFIG_GPIOLIB
 225         struct gpio_chip        gc;
 226         u8                      config;
 227         u8                      gpio_mode;
 228         bool                    gpio_registered;
 229 #endif
 230         u8                      partnum;
 231 };
 232
 233 struct cp210x_port_private {
 234         __u8                    bInterfaceNumber;
 235         bool                    has_swapped_line_ctl;
 236 };
 237
 238 static struct usb_serial_driver cp210x_device = {
 239         .driver = {
 240                 .owner =        THIS_MODULE,
 241                 .name =         "cp210x",
 242         },
 243         .id_table               = id_table,
 244         .num_ports              = 1,
 245         .bulk_in_size           = 256,
 246         .bulk_out_size          = 256,
 247         .open                   = cp210x_open,
 248         .close                  = cp210x_close,
 249         .break_ctl              = cp210x_break_ctl,
 250         .set_termios            = cp210x_set_termios,
 251         .tx_empty               = cp210x_tx_empty,
 252         .tiocmget               = cp210x_tiocmget,
 253         .tiocmset               = cp210x_tiocmset,
 254         .attach                 = cp210x_attach,
 255         .disconnect             = cp210x_disconnect,
 256         .release                = cp210x_release,
 257         .port_probe             = cp210x_port_probe,
 258         .port_remove            = cp210x_port_remove,
 259         .dtr_rts                = cp210x_dtr_rts
 260 };
 261
 262 static struct usb_serial_driver * const serial_drivers[] = {
 263         &cp210x_device, NULL
 264 };
 265
 266 /* Config request types */
 267 #define REQTYPE_HOST_TO_INTERFACE       0x41
 268 #define REQTYPE_INTERFACE_TO_HOST       0xc1
 269 #define REQTYPE_HOST_TO_DEVICE  0x40
 270 #define REQTYPE_DEVICE_TO_HOST  0xc0
 271
 272 /* Config request codes */
 273 #define CP210X_IFC_ENABLE       0x00
 274 #define CP210X_SET_BAUDDIV      0x01
 275 #define CP210X_GET_BAUDDIV      0x02
 276 #define CP210X_SET_LINE_CTL     0x03
 277 #define CP210X_GET_LINE_CTL     0x04
 278 #define CP210X_SET_BREAK        0x05
 279 #define CP210X_IMM_CHAR         0x06
 280 #define CP210X_SET_MHS          0x07
 281 #define CP210X_GET_MDMSTS       0x08
 282 #define CP210X_SET_XON          0x09
 283 #define CP210X_SET_XOFF         0x0A
 284 #define CP210X_SET_EVENTMASK    0x0B
 285 #define CP210X_GET_EVENTMASK    0x0C
 286 #define CP210X_SET_CHAR         0x0D
 287 #define CP210X_GET_CHARS        0x0E
 288 #define CP210X_GET_PROPS        0x0F
 289 #define CP210X_GET_COMM_STATUS  0x10
 290 #define CP210X_RESET            0x11
 291 #define CP210X_PURGE            0x12
 292 #define CP210X_SET_FLOW         0x13
 293 #define CP210X_GET_FLOW         0x14
 294 #define CP210X_EMBED_EVENTS     0x15
 295 #define CP210X_GET_EVENTSTATE   0x16
 296 #define CP210X_SET_CHARS        0x19
 297 #define CP210X_GET_BAUDRATE     0x1D
 298 #define CP210X_SET_BAUDRATE     0x1E
 299 #define CP210X_VENDOR_SPECIFIC  0xFF
 300
 301 /* CP210X_IFC_ENABLE */
 302 #define UART_ENABLE             0x0001
 303 #define UART_DISABLE            0x0000
 304
 305 /* CP210X_(SET|GET)_BAUDDIV */
 306 #define BAUD_RATE_GEN_FREQ      0x384000
 307
 308 /* CP210X_(SET|GET)_LINE_CTL */
 309 #define BITS_DATA_MASK          0X0f00
 310 #define BITS_DATA_5             0X0500
 311 #define BITS_DATA_6             0X0600
 312 #define BITS_DATA_7             0X0700
 313 #define BITS_DATA_8             0X0800
 314 #define BITS_DATA_9             0X0900
 315
 316 #define BITS_PARITY_MASK        0x00f0
 317 #define BITS_PARITY_NONE        0x0000
 318 #define BITS_PARITY_ODD         0x0010
 319 #define BITS_PARITY_EVEN        0x0020
 320 #define BITS_PARITY_MARK        0x0030
 321 #define BITS_PARITY_SPACE       0x0040
 322
 323 #define BITS_STOP_MASK          0x000f
 324 #define BITS_STOP_1             0x0000
 325 #define BITS_STOP_1_5           0x0001
 326 #define BITS_STOP_2             0x0002
 327
 328 /* CP210X_SET_BREAK */
 329 #define BREAK_ON                0x0001
 330 #define BREAK_OFF               0x0000
 331
 332 /* CP210X_(SET_MHS|GET_MDMSTS) */
 333 #define CONTROL_DTR             0x0001
 334 #define CONTROL_RTS             0x0002
 335 #define CONTROL_CTS             0x0010
 336 #define CONTROL_DSR             0x0020
 337 #define CONTROL_RING            0x0040
 338 #define CONTROL_DCD             0x0080
 339 #define CONTROL_WRITE_DTR       0x0100
 340 #define CONTROL_WRITE_RTS       0x0200
 341
 342 /* CP210X_VENDOR_SPECIFIC values */
 343 #define CP210X_READ_LATCH       0x00C2
 344 #define CP210X_GET_PARTNUM      0x370B
 345 #define CP210X_GET_PORTCONFIG   0x370C
 346 #define CP210X_GET_DEVICEMODE   0x3711
 347 #define CP210X_WRITE_LATCH      0x37E1
 348
 349 /* Part number definitions */
 350 #define CP210X_PARTNUM_CP2101   0x01
 351 #define CP210X_PARTNUM_CP2102   0x02
 352 #define CP210X_PARTNUM_CP2103   0x03
 353 #define CP210X_PARTNUM_CP2104   0x04
 354 #define CP210X_PARTNUM_CP2105   0x05
 355 #define CP210X_PARTNUM_CP2108   0x08
 356 #define CP210X_PARTNUM_UNKNOWN  0xFF
 357
 358 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
 359 struct cp210x_comm_status {
 360         __le32   ulErrors;
 361         __le32   ulHoldReasons;
 362         __le32   ulAmountInInQueue;
 363         __le32   ulAmountInOutQueue;
 364         u8       bEofReceived;
 365         u8       bWaitForImmediate;
 366         u8       bReserved;
 367 } __packed;
 368
 369 /*
 370  * CP210X_PURGE - 16 bits passed in wValue of USB request.
 371  * SiLabs app note AN571 gives a strange description of the 4 bits:
 372  * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive.
 373  * writing 1 to all, however, purges cp2108 well enough to avoid the hang.
 374  */
 375 #define PURGE_ALL               0x000f
 376
 377 /* CP210X_GET_FLOW/CP210X_SET_FLOW read/write these 0x10 bytes */
 378 struct cp210x_flow_ctl {
 379         __le32  ulControlHandshake;
 380         __le32  ulFlowReplace;
 381         __le32  ulXonLimit;
 382         __le32  ulXoffLimit;
 383 } __packed;
 384
 385 /* cp210x_flow_ctl::ulControlHandshake */
 386 #define CP210X_SERIAL_DTR_MASK          GENMASK(1, 0)
 387 #define CP210X_SERIAL_DTR_SHIFT(_mode)  (_mode)
 388 #define CP210X_SERIAL_CTS_HANDSHAKE     BIT(3)
 389 #define CP210X_SERIAL_DSR_HANDSHAKE     BIT(4)
 390 #define CP210X_SERIAL_DCD_HANDSHAKE     BIT(5)
 391 #define CP210X_SERIAL_DSR_SENSITIVITY   BIT(6)
 392
 393 /* values for cp210x_flow_ctl::ulControlHandshake::CP210X_SERIAL_DTR_MASK */
 394 #define CP210X_SERIAL_DTR_INACTIVE      0
 395 #define CP210X_SERIAL_DTR_ACTIVE        1
 396 #define CP210X_SERIAL_DTR_FLOW_CTL      2
 397
 398 /* cp210x_flow_ctl::ulFlowReplace */
 399 #define CP210X_SERIAL_AUTO_TRANSMIT     BIT(0)
 400 #define CP210X_SERIAL_AUTO_RECEIVE      BIT(1)
 401 #define CP210X_SERIAL_ERROR_CHAR        BIT(2)
 402 #define CP210X_SERIAL_NULL_STRIPPING    BIT(3)
 403 #define CP210X_SERIAL_BREAK_CHAR        BIT(4)
 404 #define CP210X_SERIAL_RTS_MASK          GENMASK(7, 6)
 405 #define CP210X_SERIAL_RTS_SHIFT(_mode)  (_mode << 6)
 406 #define CP210X_SERIAL_XOFF_CONTINUE     BIT(31)
 407
 408 /* values for cp210x_flow_ctl::ulFlowReplace::CP210X_SERIAL_RTS_MASK */
 409 #define CP210X_SERIAL_RTS_INACTIVE      0
 410 #define CP210X_SERIAL_RTS_ACTIVE        1
 411 #define CP210X_SERIAL_RTS_FLOW_CTL      2
 412
 413 /* CP210X_VENDOR_SPECIFIC, CP210X_GET_DEVICEMODE call reads these 0x2 bytes. */
 414 struct cp210x_pin_mode {
 415         u8      eci;
 416         u8      sci;
 417 } __packed;
 418
 419 #define CP210X_PIN_MODE_MODEM           0
 420 #define CP210X_PIN_MODE_GPIO            BIT(0)
 421
 422 /*
 423  * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0xf bytes.
 424  * Structure needs padding due to unused/unspecified bytes.
 425  */
 426 struct cp210x_config {
 427         __le16  gpio_mode;
 428         u8      __pad0[2];
 429         __le16  reset_state;
 430         u8      __pad1[4];
 431         __le16  suspend_state;
 432         u8      sci_cfg;
 433         u8      eci_cfg;
 434         u8      device_cfg;
 435 } __packed;
 436
 437 /* GPIO modes */
 438 #define CP210X_SCI_GPIO_MODE_OFFSET     9
 439 #define CP210X_SCI_GPIO_MODE_MASK       GENMASK(11, 9)
 440
 441 #define CP210X_ECI_GPIO_MODE_OFFSET     2
 442 #define CP210X_ECI_GPIO_MODE_MASK       GENMASK(3, 2)
 443
 444 /* CP2105 port configuration values */
 445 #define CP2105_GPIO0_TXLED_MODE         BIT(0)
 446 #define CP2105_GPIO1_RXLED_MODE         BIT(1)
 447 #define CP2105_GPIO1_RS485_MODE         BIT(2)
 448
 449 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */
 450 struct cp210x_gpio_write {
 451         u8      mask;
 452         u8      state;
 453 } __packed;
 454
 455 /*
 456  * Helper to get interface number when we only have struct usb_serial.
 457  */
 458 static u8 cp210x_interface_num(struct usb_serial *serial)
 459 {
 460         struct usb_host_interface *cur_altsetting;
 461
 462         cur_altsetting = serial->interface->cur_altsetting;
 463
 464         return cur_altsetting->desc.bInterfaceNumber;
 465 }
 466
 467 /*
 468  * Reads a variable-sized block of CP210X_ registers, identified by req.
 469  * Returns data into buf in native USB byte order.
 470  */
 471 static int cp210x_read_reg_block(struct usb_serial_port *port, u8 req,
 472                 void *buf, int bufsize)
 473 {
 474         struct usb_serial *serial = port->serial;
 475         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 476         void *dmabuf;
 477         int result;
 478
 479         dmabuf = kmalloc(bufsize, GFP_KERNEL);
 480         if (!dmabuf) {
 481                 /*
 482                  * FIXME Some callers don't bother to check for error,
 483                  * at least give them consistent junk until they are fixed
 484                  */
 485                 memset(buf, 0, bufsize);
 486                 return -ENOMEM;
 487         }
 488
 489         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 490                         req, REQTYPE_INTERFACE_TO_HOST, 0,
 491                         port_priv->bInterfaceNumber, dmabuf, bufsize,
 492                         USB_CTRL_SET_TIMEOUT);
 493         if (result == bufsize) {
 494                 memcpy(buf, dmabuf, bufsize);
 495                 result = 0;
 496         } else {
 497                 dev_err(&port->dev, "failed get req 0x%x size %d status: %d\n",
 498                                 req, bufsize, result);
 499                 if (result >= 0)
 500                         result = -EIO;
 501
 502                 /*
 503                  * FIXME Some callers don't bother to check for error,
 504                  * at least give them consistent junk until they are fixed
 505                  */
 506                 memset(buf, 0, bufsize);
 507         }
 508
 509         kfree(dmabuf);
 510
 511         return result;
 512 }
 513
 514 /*
 515  * Reads any 32-bit CP210X_ register identified by req.
 516  */
 517 static int cp210x_read_u32_reg(struct usb_serial_port *port, u8 req, u32 *val)
 518 {
 519         __le32 le32_val;
 520         int err;
 521
 522         err = cp210x_read_reg_block(port, req, &le32_val, sizeof(le32_val));
 523         if (err) {
 524                 /*
 525                  * FIXME Some callers don't bother to check for error,
 526                  * at least give them consistent junk until they are fixed
 527                  */
 528                 *val = 0;
 529                 return err;
 530         }
 531
 532         *val = le32_to_cpu(le32_val);
 533
 534         return 0;
 535 }
 536
 537 /*
 538  * Reads any 16-bit CP210X_ register identified by req.
 539  */
 540 static int cp210x_read_u16_reg(struct usb_serial_port *port, u8 req, u16 *val)
 541 {
 542         __le16 le16_val;
 543         int err;
 544
 545         err = cp210x_read_reg_block(port, req, &le16_val, sizeof(le16_val));
 546         if (err)
 547                 return err;
 548
 549         *val = le16_to_cpu(le16_val);
 550
 551         return 0;
 552 }
 553
 554 /*
 555  * Reads any 8-bit CP210X_ register identified by req.
 556  */
 557 static int cp210x_read_u8_reg(struct usb_serial_port *port, u8 req, u8 *val)
 558 {
 559         return cp210x_read_reg_block(port, req, val, sizeof(*val));
 560 }
 561
 562 /*
 563  * Reads a variable-sized vendor block of CP210X_ registers, identified by val.
 564  * Returns data into buf in native USB byte order.
 565  */
 566 static int cp210x_read_vendor_block(struct usb_serial *serial, u8 type, u16 val,
 567                                     void *buf, int bufsize)
 568 {
 569         void *dmabuf;
 570         int result;
 571
 572         dmabuf = kmalloc(bufsize, GFP_KERNEL);
 573         if (!dmabuf)
 574                 return -ENOMEM;
 575
 576         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 577                                  CP210X_VENDOR_SPECIFIC, type, val,
 578                                  cp210x_interface_num(serial), dmabuf, bufsize,
 579                                  USB_CTRL_GET_TIMEOUT);
 580         if (result == bufsize) {
 581                 memcpy(buf, dmabuf, bufsize);
 582                 result = 0;
 583         } else {
 584                 dev_err(&serial->interface->dev,
 585                         "failed to get vendor val 0x%04x size %d: %d\n", val,
 586                         bufsize, result);
 587                 if (result >= 0)
 588                         result = -EIO;
 589         }
 590
 591         kfree(dmabuf);
 592
 593         return result;
 594 }
 595
 596 /*
 597  * Writes any 16-bit CP210X_ register (req) whose value is passed
 598  * entirely in the wValue field of the USB request.
 599  */
 600 static int cp210x_write_u16_reg(struct usb_serial_port *port, u8 req, u16 val)
 601 {
 602         struct usb_serial *serial = port->serial;
 603         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 604         int result;
 605
 606         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 607                         req, REQTYPE_HOST_TO_INTERFACE, val,
 608                         port_priv->bInterfaceNumber, NULL, 0,
 609                         USB_CTRL_SET_TIMEOUT);
 610         if (result < 0) {
 611                 dev_err(&port->dev, "failed set request 0x%x status: %d\n",
 612                                 req, result);
 613         }
 614
 615         return result;
 616 }
 617
 618 /*
 619  * Writes a variable-sized block of CP210X_ registers, identified by req.
 620  * Data in buf must be in native USB byte order.
 621  */
 622 static int cp210x_write_reg_block(struct usb_serial_port *port, u8 req,
 623                 void *buf, int bufsize)
 624 {
 625         struct usb_serial *serial = port->serial;
 626         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 627         void *dmabuf;
 628         int result;
 629
 630         dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
 631         if (!dmabuf)
 632                 return -ENOMEM;
 633
 634         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 635                         req, REQTYPE_HOST_TO_INTERFACE, 0,
 636                         port_priv->bInterfaceNumber, dmabuf, bufsize,
 637                         USB_CTRL_SET_TIMEOUT);
 638
 639         kfree(dmabuf);
 640
 641         if (result == bufsize) {
 642                 result = 0;
 643         } else {
 644                 dev_err(&port->dev, "failed set req 0x%x size %d status: %d\n",
 645                                 req, bufsize, result);
 646                 if (result >= 0)
 647                         result = -EIO;
 648         }
 649
 650         return result;
 651 }
 652
 653 /*
 654  * Writes any 32-bit CP210X_ register identified by req.
 655  */
 656 static int cp210x_write_u32_reg(struct usb_serial_port *port, u8 req, u32 val)
 657 {
 658         __le32 le32_val;
 659
 660         le32_val = cpu_to_le32(val);
 661
 662         return cp210x_write_reg_block(port, req, &le32_val, sizeof(le32_val));
 663 }
 664
 665 #ifdef CONFIG_GPIOLIB
 666 /*
 667  * Writes a variable-sized vendor block of CP210X_ registers, identified by val.
 668  * Data in buf must be in native USB byte order.
 669  */
 670 static int cp210x_write_vendor_block(struct usb_serial *serial, u8 type,
 671                                      u16 val, void *buf, int bufsize)
 672 {
 673         void *dmabuf;
 674         int result;
 675
 676         dmabuf = kmemdup(buf, bufsize, GFP_KERNEL);
 677         if (!dmabuf)
 678                 return -ENOMEM;
 679
 680         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 681                                  CP210X_VENDOR_SPECIFIC, type, val,
 682                                  cp210x_interface_num(serial), dmabuf, bufsize,
 683                                  USB_CTRL_SET_TIMEOUT);
 684
 685         kfree(dmabuf);
 686
 687         if (result == bufsize) {
 688                 result = 0;
 689         } else {
 690                 dev_err(&serial->interface->dev,
 691                         "failed to set vendor val 0x%04x size %d: %d\n", val,
 692                         bufsize, result);
 693                 if (result >= 0)
 694                         result = -EIO;
 695         }
 696
 697         return result;
 698 }
 699 #endif
 700
 701 /*
 702  * Detect CP2108 GET_LINE_CTL bug and activate workaround.
 703  * Write a known good value 0x800, read it back.
 704  * If it comes back swapped the bug is detected.
 705  * Preserve the original register value.
 706  */
 707 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port)
 708 {
 709         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 710         u16 line_ctl_save;
 711         u16 line_ctl_test;
 712         int err;
 713
 714         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_save);
 715         if (err)
 716                 return err;
 717
 718         err = cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, 0x800);
 719         if (err)
 720                 return err;
 721
 722         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, &line_ctl_test);
 723         if (err)
 724                 return err;
 725
 726         if (line_ctl_test == 8) {
 727                 port_priv->has_swapped_line_ctl = true;
 728                 line_ctl_save = swab16(line_ctl_save);
 729         }
 730
 731         return cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, line_ctl_save);
 732 }
 733
 734 /*
 735  * Must always be called instead of cp210x_read_u16_reg(CP210X_GET_LINE_CTL)
 736  * to workaround cp2108 bug and get correct value.
 737  */
 738 static int cp210x_get_line_ctl(struct usb_serial_port *port, u16 *ctl)
 739 {
 740         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 741         int err;
 742
 743         err = cp210x_read_u16_reg(port, CP210X_GET_LINE_CTL, ctl);
 744         if (err)
 745                 return err;
 746
 747         /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */
 748         if (port_priv->has_swapped_line_ctl)
 749                 *ctl = swab16(*ctl);
 750
 751         return 0;
 752 }
 753
 754 /*
 755  * cp210x_quantise_baudrate
 756  * Quantises the baud rate as per AN205 Table 1
 757  */
 758 static unsigned int cp210x_quantise_baudrate(unsigned int baud)
 759 {
 760         if (baud <= 300)
 761                 baud = 300;
 762         else if (baud <= 600)      baud = 600;
 763         else if (baud <= 1200)     baud = 1200;
 764         else if (baud <= 1800)     baud = 1800;
 765         else if (baud <= 2400)     baud = 2400;
 766         else if (baud <= 4000)     baud = 4000;
 767         else if (baud <= 4803)     baud = 4800;
 768         else if (baud <= 7207)     baud = 7200;
 769         else if (baud <= 9612)     baud = 9600;
 770         else if (baud <= 14428)    baud = 14400;
 771         else if (baud <= 16062)    baud = 16000;
 772         else if (baud <= 19250)    baud = 19200;
 773         else if (baud <= 28912)    baud = 28800;
 774         else if (baud <= 38601)    baud = 38400;
 775         else if (baud <= 51558)    baud = 51200;
 776         else if (baud <= 56280)    baud = 56000;
 777         else if (baud <= 58053)    baud = 57600;
 778         else if (baud <= 64111)    baud = 64000;
 779         else if (baud <= 77608)    baud = 76800;
 780         else if (baud <= 117028)   baud = 115200;
 781         else if (baud <= 129347)   baud = 128000;
 782         else if (baud <= 156868)   baud = 153600;
 783         else if (baud <= 237832)   baud = 230400;
 784         else if (baud <= 254234)   baud = 250000;
 785         else if (baud <= 273066)   baud = 256000;
 786         else if (baud <= 491520)   baud = 460800;
 787         else if (baud <= 567138)   baud = 500000;
 788         else if (baud <= 670254)   baud = 576000;
 789         else if (baud < 1000000)
 790                 baud = 921600;
 791         else if (baud > 2000000)
 792                 baud = 2000000;
 793         return baud;
 794 }
 795
 796 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 797 {
 798         int result;
 799
 800         result = cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_ENABLE);
 801         if (result) {
 802                 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
 803                 return result;
 804         }
 805
 806         /* Configure the termios structure */
 807         cp210x_get_termios(tty, port);
 808
 809         /* The baud rate must be initialised on cp2104 */
 810         if (tty)
 811                 cp210x_change_speed(tty, port, NULL);
 812
 813         return usb_serial_generic_open(tty, port);
 814 }
 815
 816 static void cp210x_close(struct usb_serial_port *port)
 817 {
 818         usb_serial_generic_close(port);
 819
 820         /* Clear both queues; cp2108 needs this to avoid an occasional hang */
 821         cp210x_write_u16_reg(port, CP210X_PURGE, PURGE_ALL);
 822
 823         cp210x_write_u16_reg(port, CP210X_IFC_ENABLE, UART_DISABLE);
 824 }
 825
 826 /*
 827  * Read how many bytes are waiting in the TX queue.
 828  */
 829 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port,
 830                 u32 *count)
 831 {
 832         struct usb_serial *serial = port->serial;
 833         struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
 834         struct cp210x_comm_status *sts;
 835         int result;
 836
 837         sts = kmalloc(sizeof(*sts), GFP_KERNEL);
 838         if (!sts)
 839                 return -ENOMEM;
 840
 841         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 842                         CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST,
 843                         0, port_priv->bInterfaceNumber, sts, sizeof(*sts),
 844                         USB_CTRL_GET_TIMEOUT);
 845         if (result == sizeof(*sts)) {
 846                 *count = le32_to_cpu(sts->ulAmountInOutQueue);
 847                 result = 0;
 848         } else {
 849                 dev_err(&port->dev, "failed to get comm status: %d\n", result);
 850                 if (result >= 0)
 851                         result = -EIO;
 852         }
 853
 854         kfree(sts);
 855
 856         return result;
 857 }
 858
 859 static bool cp210x_tx_empty(struct usb_serial_port *port)
 860 {
 861         int err;
 862         u32 count;
 863
 864         err = cp210x_get_tx_queue_byte_count(port, &count);
 865         if (err)
 866                 return true;
 867
 868         return !count;
 869 }
 870
 871 /*
 872  * cp210x_get_termios
 873  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 874  * from the device, corrects any unsupported values, and configures the
 875  * termios structure to reflect the state of the device
 876  */
 877 static void cp210x_get_termios(struct tty_struct *tty,
 878         struct usb_serial_port *port)
 879 {
 880         unsigned int baud;
 881
 882         if (tty) {
 883                 cp210x_get_termios_port(tty->driver_data,
 884                         &tty->termios.c_cflag, &baud);
 885                 tty_encode_baud_rate(tty, baud, baud);
 886         } else {
 887                 tcflag_t cflag;
 888                 cflag = 0;
 889                 cp210x_get_termios_port(port, &cflag, &baud);
 890         }
 891 }
 892
 893 /*
 894  * cp210x_get_termios_port
 895  * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
 896  */
 897 static void cp210x_get_termios_port(struct usb_serial_port *port,
 898         tcflag_t *cflagp, unsigned int *baudp)
 899 {
 900         struct device *dev = &port->dev;
 901         tcflag_t cflag;
 902         struct cp210x_flow_ctl flow_ctl;
 903         u32 baud;
 904         u16 bits;
 905         u32 ctl_hs;
 906
 907         cp210x_read_u32_reg(port, CP210X_GET_BAUDRATE, &baud);
 908
 909         dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud);
 910         *baudp = baud;
 911
 912         cflag = *cflagp;
 913
 914         cp210x_get_line_ctl(port, &bits);
 915         cflag &= ~CSIZE;
 916         switch (bits & BITS_DATA_MASK) {
 917         case BITS_DATA_5:
 918                 dev_dbg(dev, "%s - data bits = 5\n", __func__);
 919                 cflag |= CS5;
 920                 break;
 921         case BITS_DATA_6:
 922                 dev_dbg(dev, "%s - data bits = 6\n", __func__);
 923                 cflag |= CS6;
 924                 break;
 925         case BITS_DATA_7:
 926                 dev_dbg(dev, "%s - data bits = 7\n", __func__);
 927                 cflag |= CS7;
 928                 break;
 929         case BITS_DATA_8:
 930                 dev_dbg(dev, "%s - data bits = 8\n", __func__);
 931                 cflag |= CS8;
 932                 break;
 933         case BITS_DATA_9:
 934                 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__);
 935                 cflag |= CS8;
 936                 bits &= ~BITS_DATA_MASK;
 937                 bits |= BITS_DATA_8;
 938                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 939                 break;
 940         default:
 941                 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__);
 942                 cflag |= CS8;
 943                 bits &= ~BITS_DATA_MASK;
 944                 bits |= BITS_DATA_8;
 945                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 946                 break;
 947         }
 948
 949         switch (bits & BITS_PARITY_MASK) {
 950         case BITS_PARITY_NONE:
 951                 dev_dbg(dev, "%s - parity = NONE\n", __func__);
 952                 cflag &= ~PARENB;
 953                 break;
 954         case BITS_PARITY_ODD:
 955                 dev_dbg(dev, "%s - parity = ODD\n", __func__);
 956                 cflag |= (PARENB|PARODD);
 957                 break;
 958         case BITS_PARITY_EVEN:
 959                 dev_dbg(dev, "%s - parity = EVEN\n", __func__);
 960                 cflag &= ~PARODD;
 961                 cflag |= PARENB;
 962                 break;
 963         case BITS_PARITY_MARK:
 964                 dev_dbg(dev, "%s - parity = MARK\n", __func__);
 965                 cflag |= (PARENB|PARODD|CMSPAR);
 966                 break;
 967         case BITS_PARITY_SPACE:
 968                 dev_dbg(dev, "%s - parity = SPACE\n", __func__);
 969                 cflag &= ~PARODD;
 970                 cflag |= (PARENB|CMSPAR);
 971                 break;
 972         default:
 973                 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__);
 974                 cflag &= ~PARENB;
 975                 bits &= ~BITS_PARITY_MASK;
 976                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 977                 break;
 978         }
 979
 980         cflag &= ~CSTOPB;
 981         switch (bits & BITS_STOP_MASK) {
 982         case BITS_STOP_1:
 983                 dev_dbg(dev, "%s - stop bits = 1\n", __func__);
 984                 break;
 985         case BITS_STOP_1_5:
 986                 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__);
 987                 bits &= ~BITS_STOP_MASK;
 988                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 989                 break;
 990         case BITS_STOP_2:
 991                 dev_dbg(dev, "%s - stop bits = 2\n", __func__);
 992                 cflag |= CSTOPB;
 993                 break;
 994         default:
 995                 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__);
 996                 bits &= ~BITS_STOP_MASK;
 997                 cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits);
 998                 break;
 999         }
1000
1001         cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1002                         sizeof(flow_ctl));
1003         ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1004         if (ctl_hs & CP210X_SERIAL_CTS_HANDSHAKE) {
1005                 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1006                 cflag |= CRTSCTS;
1007         } else {
1008                 dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1009                 cflag &= ~CRTSCTS;
1010         }
1011
1012         *cflagp = cflag;
1013 }
1014
1015 /*
1016  * CP2101 supports the following baud rates:
1017  *
1018  *      300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800,
1019  *      38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600
1020  *
1021  * CP2102 and CP2103 support the following additional rates:
1022  *
1023  *      4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000,
1024  *      576000
1025  *
1026  * The device will map a requested rate to a supported one, but the result
1027  * of requests for rates greater than 1053257 is undefined (see AN205).
1028  *
1029  * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud,
1030  * respectively, with an error less than 1%. The actual rates are determined
1031  * by
1032  *
1033  *      div = round(freq / (2 x prescale x request))
1034  *      actual = freq / (2 x prescale x div)
1035  *
1036  * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1037  * or 1 otherwise.
1038  * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1039  * otherwise.
1040  */
1041 static void cp210x_change_speed(struct tty_struct *tty,
1042                 struct usb_serial_port *port, struct ktermios *old_termios)
1043 {
1044         u32 baud;
1045
1046         baud = tty->termios.c_ospeed;
1047
1048         /* This maps the requested rate to a rate valid on cp2102 or cp2103,
1049          * or to an arbitrary rate in [1M,2M].
1050          *
1051          * NOTE: B0 is not implemented.
1052          */
1053         baud = cp210x_quantise_baudrate(baud);
1054
1055         dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1056         if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1057                 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1058                 if (old_termios)
1059                         baud = old_termios->c_ospeed;
1060                 else
1061                         baud = 9600;
1062         }
1063
1064         tty_encode_baud_rate(tty, baud, baud);
1065 }
1066
1067 static void cp210x_set_termios(struct tty_struct *tty,
1068                 struct usb_serial_port *port, struct ktermios *old_termios)
1069 {
1070         struct device *dev = &port->dev;
1071         unsigned int cflag, old_cflag;
1072         u16 bits;
1073
1074         cflag = tty->termios.c_cflag;
1075         old_cflag = old_termios->c_cflag;
1076
1077         if (tty->termios.c_ospeed != old_termios->c_ospeed)
1078                 cp210x_change_speed(tty, port, old_termios);
1079
1080         /* If the number of data bits is to be updated */
1081         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
1082                 cp210x_get_line_ctl(port, &bits);
1083                 bits &= ~BITS_DATA_MASK;
1084                 switch (cflag & CSIZE) {
1085                 case CS5:
1086                         bits |= BITS_DATA_5;
1087                         dev_dbg(dev, "%s - data bits = 5\n", __func__);
1088                         break;
1089                 case CS6:
1090                         bits |= BITS_DATA_6;
1091                         dev_dbg(dev, "%s - data bits = 6\n", __func__);
1092                         break;
1093                 case CS7:
1094                         bits |= BITS_DATA_7;
1095                         dev_dbg(dev, "%s - data bits = 7\n", __func__);
1096                         break;
1097                 case CS8:
1098                 default:
1099                         bits |= BITS_DATA_8;
1100                         dev_dbg(dev, "%s - data bits = 8\n", __func__);
1101                         break;
1102                 }
1103                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1104                         dev_dbg(dev, "Number of data bits requested not supported by device\n");
1105         }
1106
1107         if ((cflag     & (PARENB|PARODD|CMSPAR)) !=
1108             (old_cflag & (PARENB|PARODD|CMSPAR))) {
1109                 cp210x_get_line_ctl(port, &bits);
1110                 bits &= ~BITS_PARITY_MASK;
1111                 if (cflag & PARENB) {
1112                         if (cflag & CMSPAR) {
1113                                 if (cflag & PARODD) {
1114                                         bits |= BITS_PARITY_MARK;
1115                                         dev_dbg(dev, "%s - parity = MARK\n", __func__);
1116                                 } else {
1117                                         bits |= BITS_PARITY_SPACE;
1118                                         dev_dbg(dev, "%s - parity = SPACE\n", __func__);
1119                                 }
1120                         } else {
1121                                 if (cflag & PARODD) {
1122                                         bits |= BITS_PARITY_ODD;
1123                                         dev_dbg(dev, "%s - parity = ODD\n", __func__);
1124                                 } else {
1125                                         bits |= BITS_PARITY_EVEN;
1126                                         dev_dbg(dev, "%s - parity = EVEN\n", __func__);
1127                                 }
1128                         }
1129                 }
1130                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1131                         dev_dbg(dev, "Parity mode not supported by device\n");
1132         }
1133
1134         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
1135                 cp210x_get_line_ctl(port, &bits);
1136                 bits &= ~BITS_STOP_MASK;
1137                 if (cflag & CSTOPB) {
1138                         bits |= BITS_STOP_2;
1139                         dev_dbg(dev, "%s - stop bits = 2\n", __func__);
1140                 } else {
1141                         bits |= BITS_STOP_1;
1142                         dev_dbg(dev, "%s - stop bits = 1\n", __func__);
1143                 }
1144                 if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
1145                         dev_dbg(dev, "Number of stop bits requested not supported by device\n");
1146         }
1147
1148         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
1149                 struct cp210x_flow_ctl flow_ctl;
1150                 u32 ctl_hs;
1151                 u32 flow_repl;
1152
1153                 cp210x_read_reg_block(port, CP210X_GET_FLOW, &flow_ctl,
1154                                 sizeof(flow_ctl));
1155                 ctl_hs = le32_to_cpu(flow_ctl.ulControlHandshake);
1156                 flow_repl = le32_to_cpu(flow_ctl.ulFlowReplace);
1157                 dev_dbg(dev, "%s - read ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1158                                 __func__, ctl_hs, flow_repl);
1159
1160                 ctl_hs &= ~CP210X_SERIAL_DSR_HANDSHAKE;
1161                 ctl_hs &= ~CP210X_SERIAL_DCD_HANDSHAKE;
1162                 ctl_hs &= ~CP210X_SERIAL_DSR_SENSITIVITY;
1163                 ctl_hs &= ~CP210X_SERIAL_DTR_MASK;
1164                 ctl_hs |= CP210X_SERIAL_DTR_SHIFT(CP210X_SERIAL_DTR_ACTIVE);
1165                 if (cflag & CRTSCTS) {
1166                         ctl_hs |= CP210X_SERIAL_CTS_HANDSHAKE;
1167
1168                         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1169                         flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1170                                         CP210X_SERIAL_RTS_FLOW_CTL);
1171                         dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
1172                 } else {
1173                         ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
1174
1175                         flow_repl &= ~CP210X_SERIAL_RTS_MASK;
1176                         flow_repl |= CP210X_SERIAL_RTS_SHIFT(
1177                                         CP210X_SERIAL_RTS_ACTIVE);
1178                         dev_dbg(dev, "%s - flow control = NONE\n", __func__);
1179                 }
1180
1181                 dev_dbg(dev, "%s - write ulControlHandshake=0x%08x, ulFlowReplace=0x%08x\n",
1182                                 __func__, ctl_hs, flow_repl);
1183                 flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
1184                 flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
1185                 cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
1186                                 sizeof(flow_ctl));
1187         }
1188
1189 }
1190
1191 static int cp210x_tiocmset(struct tty_struct *tty,
1192                 unsigned int set, unsigned int clear)
1193 {
1194         struct usb_serial_port *port = tty->driver_data;
1195         return cp210x_tiocmset_port(port, set, clear);
1196 }
1197
1198 static int cp210x_tiocmset_port(struct usb_serial_port *port,
1199                 unsigned int set, unsigned int clear)
1200 {
1201         u16 control = 0;
1202
1203         if (set & TIOCM_RTS) {
1204                 control |= CONTROL_RTS;
1205                 control |= CONTROL_WRITE_RTS;
1206         }
1207         if (set & TIOCM_DTR) {
1208                 control |= CONTROL_DTR;
1209                 control |= CONTROL_WRITE_DTR;
1210         }
1211         if (clear & TIOCM_RTS) {
1212                 control &= ~CONTROL_RTS;
1213                 control |= CONTROL_WRITE_RTS;
1214         }
1215         if (clear & TIOCM_DTR) {
1216                 control &= ~CONTROL_DTR;
1217                 control |= CONTROL_WRITE_DTR;
1218         }
1219
1220         dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control);
1221
1222         return cp210x_write_u16_reg(port, CP210X_SET_MHS, control);
1223 }
1224
1225 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
1226 {
1227         if (on)
1228                 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
1229         else
1230                 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
1231 }
1232
1233 static int cp210x_tiocmget(struct tty_struct *tty)
1234 {
1235         struct usb_serial_port *port = tty->driver_data;
1236         u8 control;
1237         int result;
1238
1239         result = cp210x_read_u8_reg(port, CP210X_GET_MDMSTS, &control);
1240         if (result)
1241                 return result;
1242
1243         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
1244                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
1245                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
1246                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
1247                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
1248                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
1249
1250         dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control);
1251
1252         return result;
1253 }
1254
1255 static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
1256 {
1257         struct usb_serial_port *port = tty->driver_data;
1258         u16 state;
1259
1260         if (break_state == 0)
1261                 state = BREAK_OFF;
1262         else
1263                 state = BREAK_ON;
1264         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
1265                 state == BREAK_OFF ? "off" : "on");
1266         cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
1267 }
1268
1269 #ifdef CONFIG_GPIOLIB
1270 static int cp210x_gpio_request(struct gpio_chip *gc, unsigned int offset)
1271 {
1272         struct usb_serial *serial = gpiochip_get_data(gc);
1273         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1274
1275         switch (offset) {
1276         case 0:
1277                 if (priv->config & CP2105_GPIO0_TXLED_MODE)
1278                         return -ENODEV;
1279                 break;
1280         case 1:
1281                 if (priv->config & (CP2105_GPIO1_RXLED_MODE |
1282                                     CP2105_GPIO1_RS485_MODE))
1283                         return -ENODEV;
1284                 break;
1285         }
1286
1287         return 0;
1288 }
1289
1290 static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
1291 {
1292         struct usb_serial *serial = gpiochip_get_data(gc);
1293         int result;
1294         u8 buf;
1295
1296         result = cp210x_read_vendor_block(serial, REQTYPE_INTERFACE_TO_HOST,
1297                                           CP210X_READ_LATCH, &buf, sizeof(buf));
1298         if (result < 0)
1299                 return result;
1300
1301         return !!(buf & BIT(gpio));
1302 }
1303
1304 static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
1305 {
1306         struct usb_serial *serial = gpiochip_get_data(gc);
1307         struct cp210x_gpio_write buf;
1308
1309         if (value == 1)
1310                 buf.state = BIT(gpio);
1311         else
1312                 buf.state = 0;
1313
1314         buf.mask = BIT(gpio);
1315
1316         cp210x_write_vendor_block(serial, REQTYPE_HOST_TO_INTERFACE,
1317                                   CP210X_WRITE_LATCH, &buf, sizeof(buf));
1318 }
1319
1320 static int cp210x_gpio_direction_get(struct gpio_chip *gc, unsigned int gpio)
1321 {
1322         /* Hardware does not support an input mode */
1323         return 0;
1324 }
1325
1326 static int cp210x_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio)
1327 {
1328         /* Hardware does not support an input mode */
1329         return -ENOTSUPP;
1330 }
1331
1332 static int cp210x_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
1333                                         int value)
1334 {
1335         return 0;
1336 }
1337
1338 static int cp210x_gpio_set_config(struct gpio_chip *gc, unsigned int gpio,
1339                                   unsigned long config)
1340 {
1341         struct usb_serial *serial = gpiochip_get_data(gc);
1342         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1343         enum pin_config_param param = pinconf_to_config_param(config);
1344
1345         /* Succeed only if in correct mode (this can't be set at runtime) */
1346         if ((param == PIN_CONFIG_DRIVE_PUSH_PULL) &&
1347             (priv->gpio_mode & BIT(gpio)))
1348                 return 0;
1349
1350         if ((param == PIN_CONFIG_DRIVE_OPEN_DRAIN) &&
1351             !(priv->gpio_mode & BIT(gpio)))
1352                 return 0;
1353
1354         return -ENOTSUPP;
1355 }
1356
1357 /*
1358  * This function is for configuring GPIO using shared pins, where other signals
1359  * are made unavailable by configuring the use of GPIO. This is believed to be
1360  * only applicable to the cp2105 at this point, the other devices supported by
1361  * this driver that provide GPIO do so in a way that does not impact other
1362  * signals and are thus expected to have very different initialisation.
1363  */
1364 static int cp2105_shared_gpio_init(struct usb_serial *serial)
1365 {
1366         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1367         struct cp210x_pin_mode mode;
1368         struct cp210x_config config;
1369         u8 intf_num = cp210x_interface_num(serial);
1370         int result;
1371
1372         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1373                                           CP210X_GET_DEVICEMODE, &mode,
1374                                           sizeof(mode));
1375         if (result < 0)
1376                 return result;
1377
1378         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1379                                           CP210X_GET_PORTCONFIG, &config,
1380                                           sizeof(config));
1381         if (result < 0)
1382                 return result;
1383
1384         /*  2 banks of GPIO - One for the pins taken from each serial port */
1385         if (intf_num == 0) {
1386                 if (mode.eci == CP210X_PIN_MODE_MODEM)
1387                         return 0;
1388
1389                 priv->config = config.eci_cfg;
1390                 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) &
1391                                                 CP210X_ECI_GPIO_MODE_MASK) >>
1392                                                 CP210X_ECI_GPIO_MODE_OFFSET);
1393                 priv->gc.ngpio = 2;
1394         } else if (intf_num == 1) {
1395                 if (mode.sci == CP210X_PIN_MODE_MODEM)
1396                         return 0;
1397
1398                 priv->config = config.sci_cfg;
1399                 priv->gpio_mode = (u8)((le16_to_cpu(config.gpio_mode) &
1400                                                 CP210X_SCI_GPIO_MODE_MASK) >>
1401                                                 CP210X_SCI_GPIO_MODE_OFFSET);
1402                 priv->gc.ngpio = 3;
1403         } else {
1404                 return -ENODEV;
1405         }
1406
1407         priv->gc.label = "cp210x";
1408         priv->gc.request = cp210x_gpio_request;
1409         priv->gc.get_direction = cp210x_gpio_direction_get;
1410         priv->gc.direction_input = cp210x_gpio_direction_input;
1411         priv->gc.direction_output = cp210x_gpio_direction_output;
1412         priv->gc.get = cp210x_gpio_get;
1413         priv->gc.set = cp210x_gpio_set;
1414         priv->gc.set_config = cp210x_gpio_set_config;
1415         priv->gc.owner = THIS_MODULE;
1416         priv->gc.parent = &serial->interface->dev;
1417         priv->gc.base = -1;
1418         priv->gc.can_sleep = true;
1419
1420         result = gpiochip_add_data(&priv->gc, serial);
1421         if (!result)
1422                 priv->gpio_registered = true;
1423
1424         return result;
1425 }
1426
1427 static void cp210x_gpio_remove(struct usb_serial *serial)
1428 {
1429         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1430
1431         if (priv->gpio_registered) {
1432                 gpiochip_remove(&priv->gc);
1433                 priv->gpio_registered = false;
1434         }
1435 }
1436
1437 #else
1438
1439 static int cp2105_shared_gpio_init(struct usb_serial *serial)
1440 {
1441         return 0;
1442 }
1443
1444 static void cp210x_gpio_remove(struct usb_serial *serial)
1445 {
1446         /* Nothing to do */
1447 }
1448
1449 #endif
1450
1451 static int cp210x_port_probe(struct usb_serial_port *port)
1452 {
1453         struct usb_serial *serial = port->serial;
1454         struct cp210x_port_private *port_priv;
1455         int ret;
1456
1457         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
1458         if (!port_priv)
1459                 return -ENOMEM;
1460
1461         port_priv->bInterfaceNumber = cp210x_interface_num(serial);
1462
1463         usb_set_serial_port_data(port, port_priv);
1464
1465         ret = cp210x_detect_swapped_line_ctl(port);
1466         if (ret) {
1467                 kfree(port_priv);
1468                 return ret;
1469         }
1470
1471         return 0;
1472 }
1473
1474 static int cp210x_port_remove(struct usb_serial_port *port)
1475 {
1476         struct cp210x_port_private *port_priv;
1477
1478         port_priv = usb_get_serial_port_data(port);
1479         kfree(port_priv);
1480
1481         return 0;
1482 }
1483
1484 static int cp210x_attach(struct usb_serial *serial)
1485 {
1486         int result;
1487         struct cp210x_serial_private *priv;
1488
1489         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1490         if (!priv)
1491                 return -ENOMEM;
1492
1493         result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
1494                                           CP210X_GET_PARTNUM, &priv->partnum,
1495                                           sizeof(priv->partnum));
1496         if (result < 0) {
1497                 dev_warn(&serial->interface->dev,
1498                          "querying part number failed\n");
1499                 priv->partnum = CP210X_PARTNUM_UNKNOWN;
1500         }
1501
1502         usb_set_serial_data(serial, priv);
1503
1504         if (priv->partnum == CP210X_PARTNUM_CP2105) {
1505                 result = cp2105_shared_gpio_init(serial);
1506                 if (result < 0) {
1507                         dev_err(&serial->interface->dev,
1508                                 "GPIO initialisation failed, continuing without GPIO support\n");
1509                 }
1510         }
1511
1512         return 0;
1513 }
1514
1515 static void cp210x_disconnect(struct usb_serial *serial)
1516 {
1517         cp210x_gpio_remove(serial);
1518 }
1519
1520 static void cp210x_release(struct usb_serial *serial)
1521 {
1522         struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1523
1524         cp210x_gpio_remove(serial);
1525
1526         kfree(priv);
1527 }
1528
1529 module_usb_serial_driver(serial_drivers, id_table);
1530
1531 MODULE_DESCRIPTION(DRIVER_DESC);
1532 MODULE_LICENSE("GPL");